phpmailer - The following SMTP Error: Data not accepted

Question

I\'m trying to figure out this issue for 6 hours. But there is nothing to make sense. Here is the scenario; There is a well formatted HTML template.

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Answer 1

Interestingly, I had the same exact issue and for me the problem was that my connection was timing out. To be able to see more details on my connections, I added $mail->SMTPDebug = 4; to my phpmailer (look up how to capture the debug since the default output function is echo).

Here's the result:

SMTP -> get_lines(): $data was ""
SMTP -> get_lines(): $str is ""
SMTP -> get_lines(): $data is ""
SMTP -> get_lines(): timed-out (10 seconds)
SMTP -> FROM SERVER:
SMTP -> ERROR: DATA not accepted from server: 

The default timeout is set to 10 seconds. If your app can support more, add this line to your phpmailer:

$mail->Timeout = 20;